Configuring Xen Domain 0 Memory Allocation at Boot Time

According to the GRUB Configuration section of the Xen User Guide the memory allocation of the host operating system may be set in the grub.conf file as follows:

title Xen 3.0 / XenLinux 2.6
kernel /boot/xen-3.0.gz dom0_mem=262144
module /boot/vmlinuz-2.6-xen0 root=/dev/sda4 ro console=tty0

"The kernel line tells GRUB where to find Xen itself and what boot parameters should be passed to it (in this case, setting the domain 0 memory allocation in kilobytes and the settings for the serial port)."